【或许玄关】站外较水题目求助

#include <bits/stdc++.h>
#define endl '\n'
using namespace std;
int n, i;
char s[15];
int main()
{
    cin >> n;
    if (n == 0)
    {
        cout << 0 << endl;
        return 0;
    }
    for (; n; i++)
    {
        if (n % 3 == 1)
        {
            s[i] = '1';
            n /= 3;
        }
        else if (n % 3 == 2)
        {
            s[i] = 'z';
            n = n / 3 + 1;
        }
        else
        {
            s[i] = '0';
            n /= 3;
        }
    }
    for (i--; i >= 0; i--)
        cout << s[i];
    cout << endl;
    return 0;
}